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xv6_test.go
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xv6_test.go
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package main
import (
"bytes"
"fmt"
"io/ioutil"
"os"
"os/exec"
"strconv"
"testing"
"time"
yaml "gopkg.in/yaml.v2"
)
type RegisterSet struct {
Eax string `yaml:"eax"`
Ecx string `yaml:"ecx"`
Edx string `yaml:"edx"`
Ebx string `yaml:"ebx"`
Esp string `yaml:"esp"`
Ebp string `yaml:"ebp"`
Esi string `yaml:"esi"`
Edi string `yaml:"edi"`
Eip string `yaml:"eip"`
Eflags string `yaml:"eflags"`
Cs string `yaml:"cs"`
Ss string `yaml:"ss"`
Ds string `yaml:"ds"`
Es string `yaml:"es"`
Fs string `yaml:"fs"`
Gs string `yaml:"gs"`
}
const (
NumStep = 10000
// NumStep = 2000000 // This is for qemu_xv6.log
)
// return the path of the gdb script
func MakeGdbScript() string {
f, _ := ioutil.TempFile("", "gdb.script")
defer f.Close()
f.Write([]byte(`
target remote localhost:1234
set architecture i8086
set confirm off
break *0x7c00
c
set variable $i = ` + strconv.Itoa(NumStep) + `
while $i > 0
si
info registers
set variable $i -= 1
end
quit
`))
return f.Name()
}
// return register values obtained from this emulator
func ExecEmu() {
// setup emulator
reader := &bytes.Buffer{}
writer := &bytes.Buffer{}
e := NewEmulator(0x7c00+0x10240000, 0x7c00, 0x6f04, false, true, reader, writer, map[uint64]string{})
// load file
bin, err := LoadFile("./xv6_testing.img")
if err != nil {
fmt.Fprintln(os.Stderr, err.Error())
os.Exit(1)
}
for i := 0; i < len(bin); i++ {
e.memory[uint32(i+0x7c00)] = bin[i]
}
e.io.hdds[0], _ = os.Open("./xv6_testing.img")
// main loop
var res []RegisterSet
for i := 0; i < NumStep; i++ {
err := e.execInst()
if err != nil {
panic(err.Error())
}
if e.eip == 0 || e.eip == 0x7c00 {
break
}
regSet := RegisterSet{
Eax: fmt.Sprintf("0x%x", e.getRegister32(EAX)),
Ecx: fmt.Sprintf("0x%x", e.getRegister32(ECX)),
Ebx: fmt.Sprintf("0x%x", e.getRegister32(EBX)),
Edx: fmt.Sprintf("0x%x", e.getRegister32(EDX)),
Esp: fmt.Sprintf("0x%x", e.getRegister32(ESP)),
Ebp: fmt.Sprintf("0x%x", e.getRegister32(EBP)),
Esi: fmt.Sprintf("0x%x", e.getRegister32(ESI)),
Edi: fmt.Sprintf("0x%x", e.getRegister32(EDI)),
Eip: fmt.Sprintf("0x%x", e.eip),
Eflags: fmt.Sprintf("0x%x", e.eflags),
Cs: fmt.Sprintf("0x%x", e.sreg[CS]),
Ss: fmt.Sprintf("0x%x", e.sreg[SS]),
Ds: fmt.Sprintf("0x%x", e.sreg[DS]),
Es: fmt.Sprintf("0x%x", e.sreg[ES]),
Fs: fmt.Sprintf("0x%x", 0),
Gs: fmt.Sprintf("0x%x", e.sreg[GS]),
}
res = append(res, regSet)
}
// dump to emu_xv6.log
// content, err := yaml.Marshal(&res)
// if err != nil {
// panic(err)
// }
// ioutil.WriteFile("emu_xv6.log", content, os.ModePerm)
os.Remove("emu_xv6.log")
file, err := os.Create("emu_xv6.log")
if err != nil {
panic(err)
}
defer file.Close()
for _, r := range res {
file.Write(([]byte)(fmt.Sprintf(
"- eax: %s\n"+
" ecx: %s\n"+
" edx: %s\n"+
" ebx: %s\n"+
" esp: %s\n"+
" ebp: %s\n"+
" esi: %s\n"+
" edi: %s\n"+
" eip: %s\n"+
" eflags: %s\n"+
" cs: %s\n"+
" ss: %s\n"+
" ds: %s\n"+
" es: %s\n"+
" fs: %s\n"+
" gs: %s\n",
r.Eax,
r.Ecx,
r.Edx,
r.Ebx,
r.Esp,
r.Ebp,
r.Esi,
r.Edi,
r.Eip,
r.Eflags,
r.Cs,
r.Ss,
r.Ds,
r.Es,
r.Fs,
r.Gs,
)))
}
}
// return register values obtained from qemu and gdb
func ExecQemu() {
_, err := os.Stat("qemu_xv6.log")
if err == nil {
// Already Exist
return
}
gdbScriptPath := MakeGdbScript()
qemuCmd := exec.Command("qemu-system-i386",
"-drive", "file=./xv6-public/fs.img,index=1,media=disk,format=raw", "-drive", "file=./xv6_testing.img,index=0,media=disk,format=raw", "-smp", "2", "-m", "512",
"-S", "-gdb", "tcp::1234", "-nographic")
qemuCmd.Start()
defer func() {
qemuCmd.Process.Kill()
qemuCmd.Wait()
}()
fmt.Printf("qemu pid=%d\n", qemuCmd.Process.Pid)
exec.Command("sh", "-c", "ps -aux | grep qemu").Output()
// fmt.Printf("ps result=%s\n", s)
gdbOutput, _ := exec.Command("sh", "-c", "gdb -x "+gdbScriptPath+` 2>/dev/null | grep \
-e "eax\s*0x" \
-e "ecx\s*0x" \
-e "edx\s*0x" \
-e "ebx\s*0x" \
-e "esp\s*0x" \
-e "ebp\s*0x" \
-e "esi\s*0x" \
-e "edi\s*0x" \
-e "eip\s*0x" \
-e "eflags\s*0x" \
-e "cs\s*0x" \
-e "ss\s*0x" \
-e "ds\s*0x" \
-e "es\s*0x" \
-e "fs\s*0x" \
-e "gs\s*0x" \
| awk '{ if ($1=="eax") print "- " $1 ": " $2; else print " " $1 ": " $2; }'
`).Output()
// fmt.Printf("gdb output=<output>%s</output>\n", gdbOutput)
file, _ := os.Create(`qemu_xv6.log`)
defer file.Close()
file.Write(([]byte)(gdbOutput))
var res []RegisterSet
err = yaml.Unmarshal([]byte(gdbOutput), &res)
if err != nil {
panic(err.Error())
}
// return res
}
func TestXv6(t *testing.T) {
b := time.Now()
ExecEmu()
a := time.Now()
fmt.Printf("Emu Execution Time is %v\n", a.Sub(b))
b = time.Now()
ExecQemu()
a = time.Now()
fmt.Printf("Qemu Execution Time is %v\n", a.Sub(b))
// wcStr, err := exec.Command(`wc`, `-l`, `*.log`).Output()
// if err != nil {
// t.Error(err)
// }
// fmt.Printf("%s", string(wcStr))
command := `diff <(sed 's/"//g' emu_xv6.log | head -n ` + fmt.Sprintf("%d", NumStep*16) + ` | grep -v eflags) <(head -n ` + fmt.Sprintf("%d", NumStep*16) + ` qemu_xv6.log | grep -v eflags)`
fmt.Printf("Diff Command is \"%s\"\n", command)
diffStr, err := exec.Command("bash", "-c", command).Output()
if err != nil {
t.Error(err)
}
if len(diffStr) > 0 {
t.Errorf("Register Difference is as below:\n%s", string(diffStr))
}
// if len(QemuRegSet) != NumStep || len(EmuRegSet) != NumStep {
// t.Fatalf("len(QemuRegSet)=%d len(EmuRegSet)=%d NumStep=%d\n",
// len(QemuRegSet), len(EmuRegSet), NumStep)
// }
}